diff --git a/lib/command_line.sh b/lib/command_line.sh
index e603fb5..ca175df 100644
--- a/lib/command_line.sh
+++ b/lib/command_line.sh
@@ -63,6 +63,9 @@ read_commandline()
             "-D"|"--no-deps")
                 export NO_DEPS=true
                 ;;
+			"-o"|"--offline")
+				export OFFLINE=true
+				;;
             "-P"|"--no-proxy")
                 export NO_PROXY=true
                 ;;
diff --git a/lib/net.sh b/lib/net.sh
new file mode 100644
index 0000000..d27cd26
--- /dev/null
+++ b/lib/net.sh
@@ -0,0 +1,177 @@
+# ------------------------------------------------------------------------------
+# Network functions
+# This file is part of the init.sh project
+# Copyright (c) 2022 Geoffray Levasseur <fatalerrors@geoffray-levasseur.org>
+# ------------------------------------------------------------------------------
+# This file is distributed under 3-clause BSD license.
+# The complete license agreement can be obtained at:
+# https://opensource.org/licenses/BSD-3-Clause
+# ------------------------------------------------------------------------------
+
+# Network interfaces list
+export IF_LIST=''
+
+# IPv4 vars:
+export DEF_IP4=''
+export DEF_CIDR4=''
+export DEF_NETMASK4=''
+export DEF_ROUTE4=''
+
+# IPv6 vars
+export DEF_IP6=''
+export DEF_CIDR6=''
+export DEF_ROUTE6=''
+
+# ------------------------------------------------------------------------------
+# Set system proxy vars
+set_system_proxy()
+{
+    # Declare proxy system vars if needed and if not already declared
+    if [[ -n $PROXY_SRV && -n $PROXY_SRV_PORT && -z $NO_PROXY ]]; then
+	export http_proxy=${http_proxy:-"http://$PROXY_SRV:$PROXY_SRV_PORT/"}
+	export https_proxy=${https_proxy:-"http://$PROXY_SRV:$PROXY_SRV_PORT/"}
+    fi
+}
+export -f set_system_proxy
+
+
+# ------------------------------------------------------------------------------
+# Convert a netmask to a CIDR notation (IPv4)
+mask2cidr4()
+{
+    # Assumes there's no "255." after a non-255 byte in the mask
+    local x=${1##*255.}
+    set -- 0^^^128^192^224^240^248^252^254^ $(( (${#1} - ${#x})*2 )) ${x%%.*}
+    x=${1%%$3*}
+    echo $(( $2 + (${#x}/4) ))
+}
+export -f mask2cidr4
+
+
+# ------------------------------------------------------------------------------
+# Convert a CIDR notation to a netmask (IPv4)
+cidr2mask4()
+{
+    # Number of args to shift, 255..255, first non-255 byte, zeroes
+    set -- $(( 5 - ($1 / 8) )) 255 255 255 255 $(( (255 << (8 - ($1 % 8))) & 255 )) 0 0 0
+    [[ $1 -gt 1 ]] && shift $1 || shift
+    echo ${1-0}.${2-0}.${3-0}.${4-0}
+}
+export -f cidr2mask4
+
+
+# ------------------------------------------------------------------------------
+# Determine if parameter is a valid IPv4 address
+isipv4 ()
+{
+    # Set up local variables
+    local  ip=$1
+
+    # Start with a regex format test
+    if [[ $ip =~ ^[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}$ ]]; then
+	local old_ifs=$IFS
+	IFS="."
+	ip=($ip)
+	IFS=$old_ifs
+	if [[ ${ip[0]} -le 255 && ${ip[1]} -le 255 \
+	    && ${ip[2]} -le 255 && ${ip[3]} -le 255 ]]; then
+	    return 0
+	fi
+    fi
+    return 1
+}
+export -f isipv4
+
+
+# ------------------------------------------------------------------------------
+# Determine if parameter is a valid IPv4 address
+isipv6 ()
+{
+    local ip="$1"
+    local regex='^([0-9a-fA-F]{0,4}:){1,7}[0-9a-fA-F]{0,4}$'
+    if [[ $ip =~ $regex ]]; then
+	return 0
+    fi
+    return 1
+}
+export -f isipv6
+
+
+# ------------------------------------------------------------------------------
+# Extract network information
+get_network_info()
+{
+    # Get info on v4 net first
+    export DEF_ROUTE4=$(ip route | awk '/default/ { print $3 }')
+    export DEF_IF4=$(ip route | awk '/default/ { print $5 }')
+    export DEF_IP4=$(ip -o route get 1.1.1.1 | cut -d " " -f 7)
+    export DEF_CIDR4=$(ip addr show | grep -w inet | grep -v 127.0.0.1 | \
+	awk '{ print $2}' | cut -d "/" -f 2)
+    export DEF_NETMASK4=$(cidr2mask4 $DEF_CIDR4)
+    export IP4_LIST=$(ip addr show | grep -w inet | grep -v 127.0.0.1 | \
+	awk '{ print $2}' | cut -d "/" -f 1)
+
+    # Now get v6 net infos
+    export DEF_ROUTE6=$(ip -6 route | awk '/default/ { print $3 }')
+    export DEF_IF6=$(ip -6 route | awk '/default/ { print $5 }')
+    export DEF_IP6=$(ip -6 -o route get 2001:503:ba3e::2:30 | cut -d " " -f 11)
+    export DEF_CIDR6=$(ip addr show | grep -w inet6 | grep -v ::1 | \
+	awk 'FNR==1 { print $2}' | cut -d "/" -f 2)
+    export IP6_LIST=$(ip addr show | grep -w inet6 | grep -v ::1 | \
+	awk '{ print $2}' | cut -d "/" -f 1)
+
+    for iface in $(ip -o -4 addr list | awk '{print $2}' | tr '\n' ' '); do
+	export IF_LIST=$(trim "$IF_LIST $iface")
+	ipaddr=$(ip -o -4 addr list $iface | awk '{print $4}' | cut -d/ -f1)
+	export IP4_LIST
+    done
+    for iface in $(ip -o -6 addr list | awk '{print $2}' | tr '\n' ' '); do
+	if [[ ! $(echo $IF_LIST | grep $iface) ]]; then
+	    export IF_LIST=$(trim "$IF_LIST $iface")
+	fi
+	ipaddr=$(ip -o -6 addr list $iface | awk '{print $4}' | cut -d/ -f1)
+	export IP4_LIST
+    done
+}
+export -f get_network_info
+
+
+# ------------------------------------------------------------------------------
+# Check availability of different aspect of the network
+check_network()
+{
+    case $1 in
+	"print")
+	    if [[ -n $DEF_IP4 ]]; then
+		prnt I "Your default (routed) address is: $DEF_IP4/$DEF_CIDR4 ($DEF_NETMASK4) on $DEF_IF4"
+		prnt I "Your default IPv4 route is: $DEF_ROUTE4"
+	    fi
+	    if [[ -n $DEF_IP6 ]]; then
+		prnt I "Your default (routed) IPv6 address is: $DEF_IP6/$DEF_CIDR6 on $DEF_IF6"
+		prnt I "Your default IPv6 route is: $DEF_ROUTE6"
+	    fi
+	    prnt I "Here is the full list of detected v4 addresses:"
+	    echo -e "         +------------+-------------------------------------------+"
+	    echo -e "         |  Interface | IP Address                                |"
+	    echo -e "         +------------+-------------------------------------------+"
+	    for iface in $IF_LIST; do
+		ipaddr=$(ip -o -4 addr list $iface | awk '{print $4}')
+		for addr in $ipaddr; do
+		    printf "         |%11s | %-42s|\n" $iface $addr
+		done
+		ipaddr=$(ip -o -6 addr list $iface | awk '{print $4}')
+		for addr in $ipaddr; do
+		    printf "         |%11s | %-42s|\n" $iface $addr
+		done
+	    done
+	    echo "         +------------+-------------------------------------------+"
+	;;
+	"lan")
+	    return 0
+	;;
+	"ternet")
+	    return 0
+	;;
+    esac
+}
+export -f check_network
diff --git a/lib/support.sh b/lib/support.sh
index 7d1ed50..228b518 100644
--- a/lib/support.sh
+++ b/lib/support.sh
@@ -33,6 +33,8 @@ Options :
 	-k, --keep-going	Continue l'execution en cas d'erreur.
 	-r, --resume		Reprend l'execution là ou elle s'est arrêté.
 	-R, --no-root-check     Ne pas vérifier les droits root (ou UID 0)
+	-o, --offline		Assume that all needed resource are available on a LAN
+						and avoid any Internet connectivity checks.
 	-P, --no-proxy		Ne pas utiliser de proxy lors de l'utilisation de
 	    			ce script (n'empêche pas leur configuration via modules)
 	-D, --no-deps		Ne pas vérifier les dépendances entre les modules.
diff --git a/lib/utils.sh b/lib/utils.sh
index 80db1d7..498cbfc 100644
--- a/lib/utils.sh
+++ b/lib/utils.sh
@@ -8,7 +8,6 @@
 # https://opensource.org/licenses/BSD-3-Clause
 # ------------------------------------------------------------------------------
 
-
 # ------------------------------------------------------------------------------
 # Define normalised time display, filename friendly
 stdtime()
@@ -49,15 +48,13 @@ export -f get_mod_name
 
 
 # ------------------------------------------------------------------------------
-# Set system proxy vars
-set_system_proxy()
+# Remove leading and trailing space of the given parameter
+trim()
 {
-    # Declare proxy system vars if needed and if not already declared
-    if [[ -n $PROXY_SRV && -n $PROXY_SRV_PORT && -z $NO_PROXY ]]; then
-        export http_proxy=${http_proxy:-"http://$PROXY_SRV:$PROXY_SRV_PORT/"}
-        export https_proxy=${https_proxy:-"http://$PROXY_SRV:$PROXY_SRV_PORT/"}
-    fi
+    local string="$@"
+    echo "$(sed -e 's/^[[:space:]]*//' -e 's/[[:space:]]*$//'<<<"${string}")"
+    unset string
 }
-export -f set_system_proxy
+export -f trim
 
 # EOF